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发明名称
Lubricating means for well-drilling rotaries
摘要
申请公布号
US2491747(A)
申请公布日期
1949.12.20
申请号
US19480061857
申请日期
1948.11.24
申请人
OIL WELL SUPPLY COMPANY
发明人
MAIER AUGUST R.
分类号
F16N7/18
主分类号
F16N7/18
代理机构
代理人
主权项
地址
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